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Quick Answer. It takes 9 to 10 hours to cook a 3-pound beef top round roast in a Crock-Pot at the low setting. The roast only requires about 5 hours of cooking time at the high setting, but this tough cut of meat isn't recommended for cooking on the high setting. The faster cook time and higher temperature doesn't break down the tough meat fibers and leaves the roast tough.
1) Cook the roast for 15 minutes at 500 degrees F. 2) After 15 minutes, turn the temperature down to 375 degrees F. 3) Continue cooking for 16 minutes per pound (ex: If your roast is 3 pounds, that would be 48 minutes).4) Remove from oven, and place pan on a cooling rack.5) Let rest for 15 minutes.) After 15 minutes, turn the temperature down to 375 degrees F. 3) Continue cooking for 16 minutes per pound (ex: If your roast is 3 pounds, that would be 48 minutes). 4) Remove from oven, and place pan on a cooling rack.